Turbo air or gas compressor



Oct. 30, V1928. l A..JuDE

' TURBO AIR 0R GAS couPnEsson Filed' April 9, 1927 f, e Z

RTT oRwEY-s.

Patented Oct. 30, 1928".

Nunir-En l svTATizs ALEXANDER JDE, 0F BIRMINGHAM, ENGLAND, ASSIGNOR TOBELLISS AND MRCOM `LIMITED, 0F BIRMINGHAM, ENGLAND, A BRITISH COMPANY.

TURBO AIR OIR GAS, COMPRESSOR.

Application' filed April 9,` 1927', V.Serial No. 182,263,` and in 'GreatBritain May 31, 1926.

This invention relates -to theprovision of water cooling chambers andpassages in the stators of lturbo air or` gas compressors.

Whilst .the most eilicient situation for cooling the gaseous fluidundergoing.compression in a turbo compressor islat the severaldiffusers, constructional Ydiculties arise in the provision of innervwater chambers within the partition wallsbetween the diii'users and thereturn channels leading therefrom back to the rotor wheel... Such waterchambers partitions. The inaccessibility oftheso-provided Vinner waterchambers and passages, however, practically precludes their beingcleaned should they., as readily occurs with dirty cooling water, becomeclogged with deposited impurities.

To avoid these difficulties, sometimes either one, sometimes both, it iscommon to abandon all provisionior` cellular cooling ,and to provideintercoolers external to the turbo compressor casing `through which thegaseous fluid vin course xof compression is led between -certain stagesof compression. It has ,also been proposed to provide interooolerswithin the yturbocompressor casing in the return channels leading. fromthe diffuse-rs .back to the impellers constituting the rotor wheel.

As above stated, the most efficient situation for cooling is at thediifusers, and the object of the .present invention is `toprovide aconstruction ofstator casing :for ,a turbo compressor wherein readilycastable and. accessible water cooling chambers are present in Athepartition `walls `of the 4 diffusera without at the same timeintroducing obstructions to the liiow of air.

With these objects in view, according to :the invention, the watercooling chambers within the partition walls between the diffusers andreturn channels leading to the impel'lers in a .turbo Vair or gascompressor are arrcnged to have radial-cum-axial ,com- -munications fromthe outer to the inner Vwater cooling chambers .of the casings throughYcorrespondingly directed Webs. Thus-instead of the-water chambers in thediiuser parti-tion walls -of-ay turboH compressor being connected to theexternal Water space oi the casing by passages in the connecting websextending inthe axial .direction ofthe machine, or in a radial directionby means of inserted small bore tubes which :is lanother well lrnownmanner, the connection .to such partition chambers is effected byradial'cum-longitudinally extending passages through correspondinglydirected Webs.

Moreover the longitudinal cross section of these passages is divergent,thus not only do .they permit radial access by a rake, scraping tool ol'the like to the ychamber, in the par-l .tition but they permit obliquemanipulation .tor shaft being shown in transverse section.`

Figs. 3 andaV are sections respectively on the line 3%-3 and the linelogFig. 1.

'lhe casing of the :turbo compressor is built accompanying l up of apluralityof-longiftudinally abutting v upper and lower semi-,annularhollow seg: `ments n. `One of these segments a is shown in Fig. Quand alongitudinal section through one complete segment and portions of twosegments abutting against same is shown in.v

Fig. l.

artis the rotor shaft and t twoconsecutive impellers or rotor wheelsthereon. 0,;0 are two consecutive `diffusers to which air is jdeliveredby the impellers b. d isr the return channel leading from a ydiffuser -eback to ,thenext impeller Z).

Each seg-ment a of the casing-is formed Aon l one face witha segmentalannular recess to serve `.as adfiifuser c., and internally with asegmental annular chamber .constitu-ting a return channel vd leadingfrom the diffuser n of lthe preceding segment. v

The walls cil, Z2 of the return channel d .divide the space` within thehollow casing segment n into ftwo `cooling water chambers,

.an outer chamber e and aninner chamber g is a substantially radialpartition wall which at its radially inner end separates the diffuser cof the segment a in front'from the return channel d formed behind the'YAThe outer water chamber( e is connect-ed to the inner water chamber fby substantially radially-cum-axially extending passages z' extendingthrough the similarly locatedwebs 'h provided at the angularly separatedintervals. The longitudinal cross section of the radial-cum-axialpassagesz' diverges rearwardly (see Fig. 4) i. e. in the directionltowards the delivery end of the machine,

and consequently in the direction towards the interconnected outer waterchamber c. Theradial situation of the passages i readily permits theinsertion of a scraper tool into the innerv water chamber f and therearwardly V- section of the passages i permits the lateral manipulationofsuch tool into and around the portions of the inner water chamberlocated between the inner ends of the passages i, moreover, the full Vsection prevailing across the entrance to the return channel d, the flowof air into thatchannel is notobstructed. At the inner Water cliamberthe V shape is largely lost (see Fig. 3). The bottom half of thecompressor (all such Vcompressors being jointed on the horizontal centreline) is thus readily cleaned and thedirt will drop out of the innerchambers f after scraping, into the outer chambers e, and thus can beremoved through the doorclosed cleaning apertures j. The top half ofYthe compressor can thus, as usual, be disconnected Vand turned upsidedown, when the 'dirt 'can be dealt with asin the bottom half.

Cooling lof the air in the diffusers `c by the water in the innerchambers f is facilitated by making each inner chamber cover f1 fofbrass or otherI metal more heat-conductive pose being to conserve theresidual velocity of air from each diffuser c and pass italong to thenext impeller b. Instead of this, however, a large cavity (Fig. 1) isprovided for the portion which may be termed the ultra-diffuser in whichare cast a large num ber of fins Z, m so that the heat created by .thenormalineffciency of the compressor strength.

peller to the next impeller, Walls of said'regether) can be more readilyextracted with- 70 vout unduly increasingthe wall surfaces at theexpensev of longitudinal crushing At the same time, the fins serv# ingas ribs increase thernormal Vcrushing strength. fi -1 f v' I'claim: Yg1. In a turbogas compressor, arcasing formed with an outer watercooling chamber, a plurality 'ofi impellers inl said casing, ysaidcasing beingformed with a diEuser and a return channel leading from' oneysaid im- '1 peller tothe next impeller, walls 0f said return channelseparating said outer water chamber from -an inner water cooling chamberVbetween said diffuserl and saidrreturn channel, and approximatelyradial Vwebs formed with approximately radial passages communicatingwith said outer and inner water chambers interconnecting said walls. 2.In a turbo' gas compressor, a casing 90 formed with an outer watercooling chamber, a plurality of impellers in said casing, said casingbeing formed with a diffuser and a return channel leading from onesaid'imturn channel separating said outerfwater chamber from an -iiinerwater cooling chainQ y ber betweensaid diffuser and said )returnchannel, andy approximately vradial webs formeel with approximatelyradial passages 1 00 oi' outwardly divergentI section communicating withsaid outer and inner water-chambers interconnecting said walls.

v 3. lIn a turbo gascompressor,l a casing formed with an outerwatercoolingchamlma Yber,aplurality of impellers in said casing,

said casing being formedwith a diffuser and a return channel leadingfrom one said impeller to the next impeller, walls of said re turnchannel separating said outer water in: chamber from anv inner watercooling chamber between said ldiffuser and said return channel, andlapproximately radial webs formed with approximately radialpassages ofoutwardly and rearwardly divergent` secila tion communicating with saidouter and jin- L Y. f

ner water chambers interconnectingV said walls. Y. y

4. `In a turbo gas compressor, a casing formed withl an outer watercooling chain- 12u (ber, a plurality of impellers in said easing,

said casing being formed with a diffuser vand a return'channelleadingfromV one said iin-V lpeller to the next impeller, walls yof said returnchannel separating said outer -water V chamber from an inner watercooling chamv ber between said diffuser and said return channel, andapproximately radial webs formed with approximately radial passagesofoutwardly andl rearwardly divergent rear- 'Wardly V-sectioncommunicating with said outer and inner Water chambers interconnectingsaid Walls.

5. In a turbo gas Compressor, a casing -5 formed with an outer Watercooling chamber, a plurality of impellers in said casing, said casingbeing formed With a diffuser and a return channel leading from onel saidimpeller to the next impeller said return chan# 10 nel providing a largecavity at the `exit from said diffuser, -fins in said cavity, walls ofsaid return channel separating said outer Water chamber from an innerwater cooling chamber between said diffuser and said re` turn channel,and ap roximatelyyradial webs formed .with approximately radial passagescommunicating with said outer and inner water chambers interconnecting`said Walls.

In testimony whereof I have signedmy naine to this specification.

ALEXANDER JUDE.A

